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Crank
2 years ago
12

The 200 meter race times at a state track meet are normally distributed with a mean of 13.56 seconds and a standard deviation of

2.24 seconds. Using the standard normal probabilities table, what is the approximate probability that a runner chosen at random will have a 200 meter time less than 13.5 seconds?
A. 0.4880
B. 0.6331
C. 0.7422
D. 0.5714
E. 0.7910
Mathematics
2 answers:
BaLLatris [955]2 years ago
8 0

Answer:

A. 0.4880

Step-by-step explanation:

First, find the z-score:

z = (x − μ) / σ

z = (13.5 − 13.56) / 2.24

z = -0.03

Using a z-score table:

P(z < -0.03) = 0.4880

BaLLatris [955]2 years ago
7 0
0.4880 is the approximate probability
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Consider two boxes, one containing one black and one white marble, the other, two black and one white marble. A box is selected
valina [46]

Answer:

\frac{7}{12}

Step-by-step explanation:

Probability refers to chance of happening of some event.

Conditional probability is the probability of an event A, given that another event B has already occurred.

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In box B_1:

No. of black balls = 1

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In box B_2:

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Probability that a black ball is chosen from box B_1 = \frac{1}{2}

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